I believe that in terms of carcinogenicity, adipose MSCs are very safe. But since they've only been in use for so long, there aren't long term follow up studies.
You can check out the first paper in this link for data from a five year period in which no additional increases in incidence of cancer were observed from patients receiving svf.
https://stemcellrevolution.com/csn-publications-2/
Thank you for that link. Very helpful.